The impact of a restrictive smoking policy on the behavior and attitudes of smokers and non-smokers was assessed by surveying random cross-sectional samples of hospital employees before, six months after and 12 months after the policy was implemented, and comparing responses with those of employees of a hospital with no restrictive policy. Effectiveness of policy implementation was also evaluated. Results indicated that the policy was well-publicized and was approved by virtually all the non-smokers and the majority of the smokers. Following implementation, employees in the smoking policy hospital were less likely to report being bothered by smoke at their work stations than were employees of the comparison hospital. Six months and one year after the policy change, smokers reported lower smoking rates while at work, although quit smoking rates and home smoking rates were similar in both hospitals.